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"How much ... all together ?" usually means add. "How much ... left ?" usually means subtract.
Subtract.
It depends on how the rest of the question is worded. If it says "how many were left," for example, that means to subtract. On the other hand, if it says something like "how many were added," it means to add.
The term SUM means add and DIFFERRENCE means subtract. They are opposites.
The opposite of add is subtract.